Method to synthesize dense crystallized sodalite pellet for immobilizing halide salt radioactive waste

Patent · Sat Jan 01 00:00:00 EST 1994

OSTI ID:869459

Koyama, Tadafumi ^[1]

---

1. Tokyo, JP

A method for immobilizing waste chloride salts containing radionuclides such as cesium and strontium and hazardous materials such as barium. A sodalite intermediate is prepared by mixing appropriate amounts of silica, alumina and sodium hydroxide with respect to sodalite and heating the mixture to form the sodalite intermediate and water. Heating is continued to drive off the water to form a water-free intermediate. The water-free intermediate is mixed with either waste salt or waste salt which has been contacted with zeolite to concentrate the radionuclides and hazardous material. The waste salt-intermediate mixture is then compacted and heated under conditions of heat and pressure to form sodalite with the waste salt, radionuclides and hazardous material trapped within the sodalite cage structure. This provides a final product having excellent leach resistant capabilities.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5340506
• OSTI ID: 869459
• Country of Publication: United States
• Language: English

Related Subjects

method
synthesize
dense
crystallized
sodalite
pellet
immobilizing
halide
salt
radioactive
waste
chloride
salts
containing
radionuclides
cesium
strontium
hazardous
materials
barium
intermediate
prepared
mixing
appropriate
amounts
silica
alumina
sodium
hydroxide
respect
heating
mixture
form
water
continued
drive
water-free
mixed
contacted
zeolite
concentrate
material
salt-intermediate
compacted
heated
conditions
heat
pressure
trapped
cage
structure
provides
final
product
excellent
leach
resistant
capabilities
waste chloride
sodium hydroxide
hazardous material
radioactive waste
hazardous materials
chloride salt
chloride salts
final product
containing radionuclides
salts containing
halide salt
immobilizing waste
leach resistant
/588/210/423/502/